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adj.双重作用的；双动的
1、double acts───双人表演，双簧；联袂演出
2、double wing───双翼
3、double act───双人表演，双簧；联袂演出
4、double chin───n.双下巴
5、double chins───n.双下巴
6、double marking───双重标志
7、double parking───双排停车；并排停车；双行泊车
8、double spacing───双倍行距
9、double-acting───双作用的；双动式的
1、If it is double acting (pushes both in and out) then it usually contains a box like shape on the cylinder.───假如是个双程汽缸（同时推动活塞进和出），那么它通常会带个盒状的东西。
2、But the double-acting type sludge pump moves back and forth every time one time completes two times attracts the draining water movement.───而双作用式泥浆泵每往复一次完成两次吸排水动作。
3、Whisk the company's plastics and stainless steel two points, beat eggs have double-acting and playing drums beat eggs and egg head machine.───本公司的打蛋器分塑料和不锈钢两种，有双动打蛋机和钢桶打蛋机及打蛋机头。
4、Quarter turn, double acting and spring return type with a totally enclosed design and no external moving linkages.───四分之一转，双动和弹簧回位类型，具有全封闭结构，没有外部活动连接。
5、Experimental results prove that the double- acting protections worked at the same moment, and protected the whole system efficiently.───实验结果表明，两种保护并行工作，能有效地保护整个波XiTong。
6、They are available in either double-acting or spring-return configurations.───他们可以以双作用或弹簧返回配置。
7、AW series of large diameter valves using pneumatic actuator fork-type transmission, reasonable structure, output torque, a double-acting and single acting.───大口径阀门采用系列aw型气动执行器拔叉式传动，结构合理，输出扭矩大，有双作用式和单作用式。
8、Double-acting pistons are often used for the first stages of compression while single-acting are common in the higher stages.───双作用活塞常用于第一级压缩，而单作用活塞常用于第二级以上的压缩。
9、This more complicated construction is required in double-acting engines.───这种非常复杂的结构多用于双向做功的发动机。